Cat HYDO oil alternative

Is there any alternative to the Cat HYDO oil for hydraulic system ? I saw some Traveller brand "Premium" Trans Hydraulic Fluid at Tractor Supply but it only lists Cat T0-2 designation which is an older one, so I'm afraid to buy it. Is there any aftermarket oil that matches the HYDO spec, Cat Hydo is $ 150 for 5 gallons at the Cat dealer and I need 4 pails. !

Cat HYDO oil alternative